What was the Teheran Conference?
Held in November of 1943, this was the first meeting of the Big Three. It was during this conference that Stalin reminded the other two leaders of their promise to send troops to western Europe. Stalin needed assistance with moving Germany troops off the Soviet's borders. After many long discussions it was agreed that the Allies would launch a major offensive against Germany in western Europe in the spring of 1944. This offensive would later be known as the D-Day Invasion.